Vulnerability-Lookup

CVE-2026-8503 (GCVE-0-2026-8503)

Vulnerability from cvelistv5 – Published: 2026-05-15 11:06 – Updated: 2026-05-15 15:37

Title

Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids

Summary

Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids. Apache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator returns a SHA-256 hash of the built-in rand() function, the epoch time, and the PID, that is hashed again. These are predictable, low-entropy sources. Predicable session ids could allow an attacker to gain access to systems. Note that version 1.3.19 has a fallback without warning to use insecure session generation method if the call to Crypt::URandom::urandom fails. However, this is unlikely as Crypt::URandom is a hardcoded requirement of the module. This issue is similar to CVE-2025-40931 for Apache::Session::Generate::MD5.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CWE

CWE-340 - Generation of Predictable Numbers or Identifiers
CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator

Assigner

CPANSec

References

5 references

URL	Tags
https://metacpan.org/release/GUIMARD/Apache-Sessi…	release-notes
https://metacpan.org/release/GUIMARD/Apache-Sessi…
https://github.com/LemonLDAPNG/Apache-Session-Bro…	patch
https://www.cve.org/CVERecord?id=CVE-2025-40931	related
https://www.cve.org/CVERecord?id=CVE-2025-40932	related

Impacted products

1 product

Vendor	Product	Version
GUIMARD	Apache::Session::Generate::SHA256	Affected: 0 , < 1.3.19 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 6.5,
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              "confidentialityImpact": "LOW",
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              "userInteraction": "NONE",
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              "version": "3.1"
            }
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                "id": "CVE-2026-8503",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-15T15:36:59.141220Z",
                "version": "2.0.3"
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          "shortName": "CISA-ADP"
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          "defaultStatus": "unaffected",
          "packageName": "Apache-Session-Browsable",
          "product": "Apache::Session::Generate::SHA256",
          "programFiles": [
            "lib/Apache/Session/Generate/SHA256.pm"
          ],
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            {
              "name": "Apache::Session::Generate::SHA256#generate"
            }
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          "vendor": "GUIMARD",
          "versions": [
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              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
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          "lang": "en",
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        }
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        },
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          "capecId": "CAPEC-102",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-102 Session Sidejacking"
            }
          ]
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      ],
      "problemTypes": [
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          "descriptions": [
            {
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              "description": "CWE-340 Generation of Predictable Numbers or Identifiers",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
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          "descriptions": [
            {
              "cweId": "CWE-338",
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              "type": "CWE"
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        {
          "tags": [
            "release-notes"
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          "url": "https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/changes"
        },
        {
          "url": "https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/diff/GUIMARD/Apache-Session-Browseable-1.3.18#lib/Apache/Session/Generate/SHA256.pm"
        },
        {
          "tags": [
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          "url": "https://github.com/LemonLDAPNG/Apache-Session-Browseable/commit/cc915cbbd266776eec3dd8bf4748b15fa827dbd0.patch"
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          "url": "https://www.cve.org/CVERecord?id=CVE-2025-40931"
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          "url": "https://www.cve.org/CVERecord?id=CVE-2025-40932"
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          "time": "2026-05-13T00:00:00.000Z",
          "value": "Issue identified by CPANSec"
        },
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          "lang": "en",
          "time": "2026-05-13T00:00:00.000Z",
          "value": "Issue reported to author"
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        {
          "lang": "en",
          "time": "2026-05-14T00:00:00.000Z",
          "value": "Version 1.3.19 released"
        }
      ],
      "title": "Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids",
      "workarounds": [
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          "lang": "en",
          "value": "Upgrade to version 1.3.19 or later."
        }
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  "cveMetadata": {
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    "datePublished": "2026-05-15T11:06:29.777Z",
    "dateReserved": "2026-05-13T21:07:03.760Z",
    "dateUpdated": "2026-05-15T15:37:28.791Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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      "date": "2026-05-27",
      "epss": "0.00041",
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}

FKIE_CVE-2026-8503

Vulnerability from fkie_nvd - Published: 2026-05-15 12:17 - Updated: 2026-05-18 18:23

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Summary

References

URL	Tags
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/LemonLDAPNG/Apache-Session-Browseable/commit/cc915cbbd266776eec3dd8bf4748b15fa827dbd0.patch	Patch
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/changes	Release Notes
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/diff/GUIMARD/Apache-Session-Browseable-1.3.18#lib/Apache/Session/Generate/SHA256.pm	Product
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://www.cve.org/CVERecord?id=CVE-2025-40931	Third Party Advisory
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://www.cve.org/CVERecord?id=CVE-2025-40932	Third Party Advisory

Impacted products

	Vendor	Product	Version
	guimard	apache\	\

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:guimard:apache\\:\\:session\\:\\:generate\\:\\:sha256:*:*:*:*:*:perl:*:*",
              "matchCriteriaId": "22FCEB1A-DF59-4660-A23B-389E42133610",
              "versionEndExcluding": "1.3.19",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids.\n\nApache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator returns a SHA-256 hash of the built-in rand() function, the epoch time, and the PID, that is hashed again. These are predictable, low-entropy sources. Predicable session ids could allow an attacker to gain access to systems.\n\nNote that version 1.3.19 has a fallback without warning to use insecure session generation method if the call to Crypt::URandom::urandom fails. However, this is unlikely as Crypt::URandom is a hardcoded requirement of the module.\n\nThis issue is similar to CVE-2025-40931 for Apache::Session::Generate::MD5."
    }
  ],
  "id": "CVE-2026-8503",
  "lastModified": "2026-05-18T18:23:03.207",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-15T12:17:09.557",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/LemonLDAPNG/Apache-Session-Browseable/commit/cc915cbbd266776eec3dd8bf4748b15fa827dbd0.patch"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Release Notes"
      ],
      "url": "https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/changes"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Product"
      ],
      "url": "https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/diff/GUIMARD/Apache-Session-Browseable-1.3.18#lib/Apache/Session/Generate/SHA256.pm"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40931"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40932"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-338"
        },
        {
          "lang": "en",
          "value": "CWE-340"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}

GHSA-2C59-FQG7-RWRX

Vulnerability from github – Published: 2026-05-15 12:30 – Updated: 2026-05-15 18:30

Details

Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids.

Apache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator returns a SHA-256 hash of the built-in rand() function, the epoch time, and the PID, that is hashed again. These are predictable, low-entropy sources. Predicable session ids could allow an attacker to gain access to systems.

Note that version 1.3.19 has a fallback without warning to use insecure session generation method if the call to Crypt::URandom::urandom fails. However, this is unlikely as Crypt::URandom is a hardcoded requirement of the module.

This issue is similar to CVE-2025-40931 for Apache::Session::Generate::MD5.

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-8503"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-338"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-15T12:17:09Z",
    "severity": "MODERATE"
  },
  "details": "Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids.\n\nApache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator returns a SHA-256 hash of the built-in rand() function, the epoch time, and the PID, that is hashed again. These are predictable, low-entropy sources. Predicable session ids could allow an attacker to gain access to systems.\n\nNote that version 1.3.19 has a fallback without warning to use insecure session generation method if the call to Crypt::URandom::urandom fails. However, this is unlikely as Crypt::URandom is a hardcoded requirement of the module.\n\nThis issue is similar to CVE-2025-40931 for Apache::Session::Generate::MD5.",
  "id": "GHSA-2c59-fqg7-rwrx",
  "modified": "2026-05-15T18:30:33Z",
  "published": "2026-05-15T12:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8503"
    },
    {
      "type": "WEB",
      "url": "https://github.com/LemonLDAPNG/Apache-Session-Browseable/commit/cc915cbbd266776eec3dd8bf4748b15fa827dbd0.patch"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/changes"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/diff/GUIMARD/Apache-Session-Browseable-1.3.18#lib/Apache/Session/Generate/SHA256.pm"
    },
    {
      "type": "WEB",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40931"
    },
    {
      "type": "WEB",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40932"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-8503 (GCVE-0-2026-8503)

FKIE_CVE-2026-8503

GHSA-2C59-FQG7-RWRX

Tags

Sightings

Nomenclature