CVE-2026-123526

5.3 mediumEPSS 0.3%

Medium (5.3) in go-vikunja vikunja. EPSS 0.3% estimated probability of exploitation activity in the next 30 days.

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Severity
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Affected
Versions
References
Your exposure

Vikunja before 2.7.1 contains a mass assignment vulnerability that allows any authenticated user to set the read-only external_id field through the team create and update endpoints. Attackers can tag a team they create or administer as externally managed, permanently blocking removal of every member and causing SSO members to be dropped from the team at their next login.

Severity

CVSS 4.0

5.3 medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

CVSS 3.1

5.4 medium

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

EPSS: 0.3% estimated probability of exploitation activity in the next 30 days; 17th percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC): Exploitation: PoC · Automatable: no · Technical impact: partial, assessed 2026-11-09. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWE: CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes
OWASP Top 10: A08:2025 Software or Data Integrity Failures
Published: 2026-11-08 02:16 UTC
Modified: 2026-11-09 14:17 UTC
NVD analysis: Deferred: the NVD does not plan to analyze it
Record from: the NVD, synced 2026-11-09 14:47 UTC

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Affected

go-vikunja:vikunja

Versions

From the CNA's record in the CVE List.

Product	Affected
go-vikunja vikunja	before 2.7.1

References

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