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CVE-2026-108086: Apache Cocoon: XEE could lead to SSRF and information disclosure

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-29
• Weakness: CWE-776

Description

** UNSUPPORTED WHEN ASSIGNED ** Improper restriction of recursive entity references in DTDs ('XML entity expansion') vulnerability in Apache Cocoon. This issue affects Apache Cocoon: all versions. XEE in the fp: form processor could lead to SSRF, including exposing files from the server to an untrusted external system As this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative or restrict access to the instance to trusted users. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Affected products

• Apache Software Foundation Apache Cocoon: all versions

References

• https://lists.apache.org/thread/mt0h1cpjzps76nq6op7714rmnq6pbtht
• http://www.openwall.com/lists/oss-security/2026/10/20/2

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