Common Weakness Enumeration
CWE-59
AllowedImproper Link Resolution Before File Access ('Link Following')
Abstraction: Base · Status: Draft
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
2426 vulnerabilities reference this CWE, most recent first.
CVE-2026-96225 (GCVE-0-2026-96225)
Vulnerability from cvelistv5 – Published: 2026-10-13 19:01 – Updated: 2026-10-19 23:51
VLAI
EPSS
VEX
Title
.NET Elevation of Privilege Vulnerability
Summary
Improper link resolution before file access ('link following') in .NET allows an authorized attacker to elevate privileges locally.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 00:00 UTC
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | .NET 10.0 |
Affected:
10.0.0 , < 10.0.13
(custom)
|
|
| Microsoft | .NET 11.0 |
Affected:
11.0.0 , < 11.0.0-rc.2
(custom)
|
|
| Microsoft | .NET 8.0 |
Affected:
8.0.0 , < 8.0.32
(custom)
|
|
| Microsoft | .NET 9.0 |
Affected:
9.0.0 , < 9.0.21
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2022 version 17.14 |
Affected:
17.14.0 , < 17.14.42
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2026 version 18.10 |
Affected:
18.10.0 , < 18.10.4
(custom)
|
Date Public
2026-10-13 14:00
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CVE-2026-94620 (GCVE-0-2026-94620)
Vulnerability from cvelistv5 – Published: 2026-10-01 15:38 – Updated: 2026-10-01 16:18
VLAI
EPSS
VEX
Title
Classroom 50 vulnerable to arbitrary file overwrite on the teacher's machine via symlink in a student repo (gh teacher download)
Summary
Classroom 50 is a free and open-source tool for managing and grading programming assignments via GitHub. Prior to version 1.11.0, `gh teacher download` clones each student's assignment repository and then writes autograde artifacts (`result.json` and `results.json`) into the just-cloned working tree. The write followed symlinks, so a student who committed `result.json` or `results.json` as a **symlink** (materialized verbatim by `git clone`) could redirect the teacher's write to an arbitrary path — e.g. `~/.zshrc`, `~/.ssh/authorized_keys`, a cron file, or an in-clone `.git/hooks/*` file that git subsequently executes. The written bytes are attacker-controlled (the student's uploaded release asset for `result.json`; student-chosen submit-tag names for `results.json`). This is an arbitrary file write leading to code execution as the teacher, whose `gh` token carries `admin:org`, `repo`, and `workflow` across the entire classroom organization. Version 1.11.0 contains a patch. Some workarounds are available. Avoid running `gh teacher download` against untrusted student repositories, or run it inside a disposable sandbox / container with no access to sensitive host files or credentials. Inspect cloned trees for symlinked, hardlinked, or special (`result.json`/`results.json`) entries before allowing the artifact-refresh step to run.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-01 16:17 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/foundation50/classroom50/secur… | x_refsource_CONFIRM |
| https://github.com/foundation50/classroom50/commi… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| foundation50 | classroom50 |
Affected:
< 1.11.0
|
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CVE-2026-93353 (GCVE-0-2026-93353)
Vulnerability from cvelistv5 – Published: 2026-09-24 20:29 – Updated: 2026-10-01 15:21 X_Open Source
VLAI
EPSS
VEX
Title
copyparty SFTP Volume Restriction Bypass via mkdir/rmdir/chattr Handlers
Summary
copyparty contains a volume restriction bypass vulnerability in its SFTP front end that allows authenticated SFTP users to create, remove, and truncate arbitrary paths outside permitted volume boundaries by exploiting three handlers that bypass the xvol volflag enforcement. The _mkdir, _rmdir, and _chattr handlers construct destination paths using vfs.get(), vn.canonical(), and os.path.join() without invoking the chk_ap access check, enabling attackers to traverse symlinks leaving a volume's top directory and perform unauthorized file creation, deletion, or truncation via SSH_FXP_SETSTAT operations on paths outside any volume the account is authorized to access.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 15:50 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://euriconicacio.github.io/blog/cve-2026-933… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/copyparty-sf… | third-party-advisory |
Impacted products
Date Public
2026-09-24 00:00
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CVE-2026-92371 (GCVE-0-2026-92371)
Vulnerability from cvelistv5 – Published: 2026-09-29 15:41 – Updated: 2026-09-30 15:28
VLAI
EPSS
VEX
Title
Local Privilege Escalation via Improper Link Resolution in Cloud Session Recording
Summary
TeamViewer Full Client and Host for Linux prior version 15.82 contains an improper path validation vulnerability in the Cloud Session Recording (CSR) functionality. By exploiting a race condition during path validation and subsequent file access, a local authenticated attacker may cause privileged file operations in unintended locations on the affected system.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 15:12 UTC
CWE
- CWE-59 - Improper link resolution before file access ('link following')
References
1 reference
| URL | Tags |
|---|---|
| https://www.teamviewer.com/en/resources/trust-cen… | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| TeamViewer | Full Client |
Affected:
15.0 , < 15.82
(custom)
|
|
| TeamViewer | Host |
Affected:
15.0 , < 15.82
(custom)
|
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CVE-2026-92253 (GCVE-0-2026-92253)
Vulnerability from cvelistv5 – Published: 2026-09-20 12:24 – Updated: 2026-09-21 14:12
VLAI
EPSS
VEX
Title
Arbitrary File Write via Directory Junction in WatchDog Anti-Virus Quarantine Restoration
Summary
Improper link resolution before file access in the quarantine restoration process of WatchDog Anti-Virus 1.8.640 on Windows allows local, low-privileged attackers to cause a quarantined file to be written to an arbitrary filesystem location by creating a directory junction at the original file path and persuading an administrator to restore the file. This may enable modification of protected files or SYSTEM-level code execution through DLL hijacking.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 14:11 UTC
CWE
- CWE-59 - Improper link resolution before file access ('link following')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| WatchDog | Anti-Virus |
Affected:
1.8.640 , < 1.8.804
(semver)
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CVE-2026-90954 (GCVE-0-2026-90954)
Vulnerability from cvelistv5 – Published: 2026-10-14 10:00 – Updated: 2026-10-19 19:04
VLAI
EPSS
VEX
Title
Busybox: busybox: dpkg-deb extraction-root escape via per-ar-member deferred symlink flush
Summary
A flaw was found in BusyBox's dpkg-deb archive extraction. The ar archive handler flushes deferred symlinks after each archive member, unlike the tar, cpio, and unzip handlers which flush once after the last member. A specially crafted .deb archive with two data.tar members can exploit this ordering: the first member declares a symlink pointing to an absolute path (e.g., '/'), which is deferred as unsafe but flushed after the first member. The second member declares a regular file whose path traverses the now-live symlink, resulting in a file being written outside the intended extraction directory. This could allow an attacker to write arbitrary files to arbitrary locations when a user extracts a crafted .deb package.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-19 19:04 UTC
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-90954 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2533007 | issue-trackingx_refsource_REDHAT |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1
|
Date Public
2026-10-14 08:00
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CVE-2026-90930 (GCVE-0-2026-90930)
Vulnerability from cvelistv5 – Published: 2026-09-14 12:48 – Updated: 2026-09-14 14:17
VLAI
EPSS
VEX
Title
File Browser through 2.63.23 Path Traversal via Symlink Alias
Summary
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Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 14:17 UTC
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/filebrowser/filebrowser/securi… | vendor-advisory |
| https://www.vulncheck.com/advisories/file-browser… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| filebrowser | filebrowser |
Affected:
0 , ≤ 2.63.23
(semver)
cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:* |
Date Public
2026-08-31 00:00
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CVE-2026-90807 (GCVE-0-2026-90807)
Vulnerability from cvelistv5 – Published: 2026-09-14 17:45 – Updated: 2026-09-16 15:59 X_Open Source
VLAI
EPSS
VEX
Title
nanocoai NanoClaw Attachment agent-route.ts forwardAttachedFiles link following
Summary
A vulnerability was found in nanocoai NanoClaw up to 2.1.17. This issue affects the function forwardAttachedFiles of the file src/modules/agent-to-agent/agent-route.ts of the component Attachment Handler. The manipulation results in link following. The attack may be performed from remote. The exploit has been made public and could be used. The patch is identified as 3f9ed607b7e7a4872747295f75286f1c377d7c33. It is advisable to implement a patch to correct this issue.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-16 15:58 UTC
CWE
- CWE-59 - Link Following
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/403309 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/403309/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-90807 | third-party-advisory |
| https://vuldb.com/submit/922841 | third-party-advisory |
| https://github.com/nanocoai/nanoclaw/issues/2828 | exploitissue-tracking |
| https://github.com/nanocoai/nanoclaw/commit/3f9ed… | patch |
| https://github.com/nanocoai/nanoclaw/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| nanocoai | NanoClaw |
Affected:
2.1.0
Affected: 2.1.1 Affected: 2.1.2 Affected: 2.1.3 Affected: 2.1.4 Affected: 2.1.5 Affected: 2.1.6 Affected: 2.1.7 Affected: 2.1.8 Affected: 2.1.9 Affected: 2.1.10 Affected: 2.1.11 Affected: 2.1.12 Affected: 2.1.13 Affected: 2.1.14 Affected: 2.1.15 Affected: 2.1.16 Affected: 2.1.17 cpe:2.3:a:nanocoai:nanoclaw:*:*:*:*:*:*:*:* |
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CVE-2026-89258 (GCVE-0-2026-89258)
Vulnerability from cvelistv5 – Published: 2026-09-11 11:15 – Updated: 2026-09-11 12:18
VLAI
EPSS
VEX
Title
Hugo before v0.165.0 Symlink Confinement Bypass via resources.Get
Summary
Hugo is a static site generator. In versions after v0.123.0 and before v0.165.0, symlinks in parent directories were not dropped during direct resource lookups, allowing path confinement to be bypassed. An attacker who can place — or who convinces a site author to place — a symlink inside a mounted directory (for example, in a locally vendored theme under themes/) can cause functions that perform direct lookups, such as resources.Get and os.ReadFile, to follow that symlink and read files outside the intended project boundaries, disclosing their contents in the built site. Themes mounted as Go modules fetched from GitHub have symlinks stripped on download and are not affected, and multi-directory walks (e.g. content/asset walking) are not affected. This issue is an incomplete-fix follow-up to GHSA-c3wq-j5vh-68rc and GHSA-fw87-fv5r-9fpw; it is fixed in v0.165.0.
Severity
6.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 12:18 UTC
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/gohugoio/hugo/security/advisor… | vendor-advisory |
| https://www.vulncheck.com/advisories/hugo-before-… | third-party-advisory |
Impacted products
Date Public
2026-08-27 00:00
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CVE-2026-89091 (GCVE-0-2026-89091)
Vulnerability from cvelistv5 – Published: 2026-10-08 21:49 – Updated: 2026-10-09 15:13
VLAI
EPSS
VEX
Title
Ansible-core: ansible-core: ansible-galaxy collection install symlink path escape allows arbitrary file write / code execution
Summary
A flaw was found in ansible-core. When installing a collection with
`ansible-galaxy collection install`, the archive extractor validates member
paths using lexical path normalisation (os.path.abspath) instead of resolving
symbolic links (os.path.realpath), and it performs no containment check on
symlink-typed directory members before creating them. A crafted collection
tarball can chain symlink directory entries so that a subsequent file member is
written outside the intended destination directory. This allows an attacker who
can get a victim to install a malicious collection to overwrite arbitrary files
with the privileges of the user running ansible-galaxy, leading to code
execution on the control node. This is a bypass of the fix for CVE-2020-10691.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 15:00 UTC
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-89091 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2531646 | issue-trackingx_refsource_REDHAT |
Impacted products
17 products
Date Public
2026-09-25 00:00
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"assignerShortName": "redhat",
"cveId": "CVE-2026-89091",
"datePublished": "2026-10-08T21:49:30.953Z",
"dateReserved": "2026-09-10T20:17:42.169Z",
"dateUpdated": "2026-10-09T15:13:02.773Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Mitigation MIT-48.1
Architecture and Design
Strategy: Separation of Privilege
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
CAPEC-132: Symlink Attack
An adversary positions a symbolic link in such a manner that the targeted user or application accesses the link's endpoint, assuming that it is accessing a file with the link's name.
CAPEC-17: Using Malicious Files
An attack of this type exploits a system's configuration that allows an adversary to either directly access an executable file, for example through shell access; or in a possible worst case allows an adversary to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
CAPEC-35: Leverage Executable Code in Non-Executable Files
An attack of this type exploits a system's trust in configuration and resource files. When the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.
CAPEC-76: Manipulating Web Input to File System Calls
An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.