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CVE-2026-39971

Serendipity is a PHP-powered weblog engine. In versions 2.6-beta2 and below, the email sending functionality in include/functions.inc.php inserts $_SERVER['HTTP_HOST'] directly into the Message-ID SMTP header without validation, and the existing sanitization function serendipity_isResponseClean() is not called on HTTP_HOST before embedding it. An attacker who can control the Host header during an email-triggering action such as comment notifications or subscription emails can inject arbitrary SM
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:eb7fc42bcdeba916aacd0ecc5a0afa4c2b018e9be1e380c591f041b8c8c4245d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"Serendipity","vendor":"s9y","versions":[{"status":"affected","version":"< 2.6.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:553ad26dfbd59f59716808a87d9f3e833483d13a875db72c7403929dae8dfdad · sha256:d7ef4b5df4dc66fc… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:553ad26dfbd59f59716808a87d9f3e833483d13a875db72c7403929dae8dfdad · sha256:d7ef4b5df4dc66fc… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-113","description":"CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:553ad26dfbd59f59716808a87d9f3e833483d13a875db72c7403929dae8dfdad · sha256:d7ef4b5df4dc66fc… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/s9y/Serendipity/releases/tag/2.6.0","tags":["x_refsource_MISC"],"url":"https://github.com/s9y/Serendipity/releases/tag/2.6.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:553ad26dfbd59f59716808a87d9f3e833483d13a875db72c7403929dae8dfdad · sha256:d7ef4b5df4dc66fc… · /containers/cna/references/1
{"name":"https://github.com/s9y/Serendipity/security/advisories/GHSA-458g-q4fh-mj6r","tags":["x_refsource_CONFIRM"],"url":"https://github.com/s9y/Serendipity/security/advisories/GHSA-458g-q4fh-mj6r"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:553ad26dfbd59f59716808a87d9f3e833483d13a875db72c7403929dae8dfdad · sha256:d7ef4b5df4dc66fc… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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