CVE-2026-5309

MEDIUM 5.4 PoC AVAILABLE

Published 2026-06-25 · Last modified 2026-06-25

GitLab has remediated an issue in GitLab EE affecting all versions from 18.6 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1 that under certain conditions could have allowed an authenticated user to read or modify another group's virtual registry cleanup policy settings without authorization.

EXPLOIT AVAILABLE

Public exploit or PoC code exists. Modeled probability is still low, but the barrier to attack is reduced — watch closely.

Exploitation likelihood

0.2%chance of exploitation in 30 days · 7th percentile

○ In CISA KEV ● Public exploit / PoC

Impact if exploited

5.4CVSS 3.1 · MEDIUM

ConfidentialityLow
IntegrityLow
AvailabilityNone

What an attacker needs

✓Access: Reachable over the network — no local access needed
⚠Privileges: Requires a low-privilege account
✓User interaction: No user interaction needed
✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

PoC https://hackerone.com/reports/3628793

Listed for defensive triage and patch prioritization.

Affected

Vendors Gitlab

Products Gitlab

Weakness (CWE)

CWE-639: Authorization bypass

CVSS vector

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

References

Exploits & PoC

https://hackerone.com/reports/3628793 technical-descriptionexploitpermissions-required

Technical & other

Sources: NVD · CVE.org · EPSS