CVE-2026-6335

🔶 medium

Summary

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user to execute arbitrary code in another user's browser session due to improper sanitization.

CVSS Score

5.4

Medium

EPSS Score

0.0

Exploit Probability

Published Date

2026-05-14

First Seen: 2026-05-17

📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 22.2% of all 365,968 vulnerabilities in our database.

#284,677

Below average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: May 15, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Total

Complete system compromise possible

🏆 Discovered By

Thanks [toofikz](https://hackerone.com/toofikz) for reporting this vulnerability through our HackerOne bug bounty program

SSVC data provided by CISA

Last Modified 2026-05-15

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-79

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
gitlab	gitlab	Affected	> 18.11.0 < 18.11.3

🔗 References 3

https://about.gitlab.com/releases/2026/05/13/patch-r...

Release Notes

https://gitlab.com/gitlab-org/gitlab/-/work_items/59...

Broken Link

https://hackerone.com/reports/3673647

Permissions Required

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-10518	🔶 medium	4.3	0.3	GitLab has remediated an issue in GitLab EE affecting all versions from 17.9 before 19.2.7, 19.3 before 19.3.3, and 19.4...	2026-09-29
CVE-2026-4523	ℹ️ low	3.7	0.4	GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.11 before 19.2.7, 19.3 before 19.3.3, and ...	2026-09-29
CVE-2026-84739	⚠️ high	8.7	0.5	GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.11 before 19.2.7, 19.3 before 19.3.3, and ...	2026-09-29
CVE-2026-8937	🔶 medium	4.3	0.3	GitLab has remediated an issue in GitLab CE/EE affecting all versions from 19.0 before 19.2.7, 19.3 before 19.3.3, and 1...	2026-09-29
CVE-2026-89078	⛔ critical	9.9	0.4	GitLab has remediated an issue in GitLab CE/EE affecting all versions from 19.2 before 19.2.7, 19.3 before 19.3.3, and 1...	2026-09-24
CVE-2026-92470	⚠️ high	7.7	0.2	GitLab has remediated an issue in GitLab EE affecting all versions from 18.7 before 19.2.7, 19.3 before 19.3.3, and 19.4...	2026-09-24

These CVEs affect the same products