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CVE-2026-25742

Zulip: Anonymous File Access After Disabling Spectator Access

Published: Apr 3, 2026Updated: Apr 13, 2026 Sources: CVE List NVDCWE-862
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.3%
Top 77.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Zulip is an open-source team collaboration tool. Prior to version 11.6, Zulip is an open-source team collaboration tool. From version 1.4.0 to before version 11.6, even after spectator access (enable_spectator_access / WEB_PUBLIC_STREAMS_ENABLED) is disabled, attachments originating from web-public streams can still be retrieved anonymously. As a result, file contents remain accessible even after public access is intended to be disabled. Similarly, even after spectator access is disabled, the /users/me/<stream_id>/topics endpoint remains reachable anonymously, allowing retrieval of topic history for web-public streams. This issue has been patched in version 11.6. This issue has been patched in version 11.6.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-862

Affected Products

zulipzulip
On-premWeb App
Enterprise Software / collaboration-groupware
zuliposs-projectEnterprise Softwareaka zulip

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236
github.com
https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae
github.com
https://github.com/zulip/zulip/releases/tag/11.6
github.com
and 1 more references View all →

Timeline

Published
Apr 3, 2026
Last Updated
Apr 13, 2026

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