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CVE-2026-40300

Zulip is an open-source team collaboration tool. Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages. This vulnerability is fixed in 12.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6e7d5fc94aff22cc694aaa7075193accb42a3f69e0817a3e6d08de7dd18fd152
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"zulip","vendor":"zulip","versions":[{"status":"affected","version":"< 12.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7e53b4cd9390a55af455e36d9a9d75c6786ac10a3ba058787406ed16cc944235 · sha256:ea8df9fe7e8bada3… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7e53b4cd9390a55af455e36d9a9d75c6786ac10a3ba058787406ed16cc944235 · sha256:ea8df9fe7e8bada3… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-284","description":"CWE-284: Improper Access Control","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7e53b4cd9390a55af455e36d9a9d75c6786ac10a3ba058787406ed16cc944235 · sha256:ea8df9fe7e8bada3… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7e53b4cd9390a55af455e36d9a9d75c6786ac10a3ba058787406ed16cc944235 · sha256:ea8df9fe7e8bada3… · /containers/adp/0/references/0
{"name":"https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7e53b4cd9390a55af455e36d9a9d75c6786ac10a3ba058787406ed16cc944235 · sha256:ea8df9fe7e8bada3… · /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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