Vulnerability · CVE-2026-21641
HackerOne community member Jad Ghamloush (0xjad) has reported an authorization bypass vulnerability in the script of Revive Adserver.
Published Jan 20, 2026 · catalog updated Jan 21, 2026 · Revive Revive Adserver
Last checked Nov 4, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-21641. EPSS is 0.27%. Act only if a listed version of Revive Revive Adserver is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-21640 · Low
- CVE-2025-55129 · Medium
- CVE-2025-48987 · Medium
- CVE-2025-48986 · High
- CVE-2025-52668 · High
- Severity
- High7.1
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.27%
- Remediation
- Vendor / distro source
- Affected products
- vendor Revive Revive Adserver 6 ≤6.0.4
HackerOne community member Jad Ghamloush (0xjad) has reported an authorization bypass vulnerability in the script of Revive Adserver. Users with permissions to delete trackers are mistakenly allowed to delete trackers owned by other accounts.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor Revive Revive Adserver 6 ≤6.0.46 ≤6.0.4
How to fix CVE-2026-21641
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
Seen in 6 ≤6.0.4
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-21641. EPSS is 0.27%. Act only if a listed version of Revive Revive Adserver is installed.
Which versions are affected?
Compare what you have installed with Revive Revive Adserver 6 ≤6.0.4 6 ≤6.0.4. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.27%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Jan 20, 2026 · EUVD
Detected
HackerOne community member Jad Ghamloush (0xjad) has reported an authorization bypass vulnerability in the script of Revive Adserver. Users with permissions to delete trackers are mistakenly allowed to delete trackers owned by other accounts.
Jan 21, 2026 · EUVD
Updated
HackerOne community member Jad Ghamloush (0xjad) has reported an authorization bypass vulnerability in the script of Revive Adserver. Users with permissions to delete trackers are mistakenly allowed to delete trackers owned by other accounts.
Sources
- CVE.orgVulnerability recordCVE-2026-21641
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-21641
30-day exploitation probability 0.27%
first.org - EUVDVulnerability recordEUVD-2026-3341
HackerOne community member Jad Ghamloush (0xjad) has reported an authorization bypass vulnerability in the script of Revive Adserver. Users with permissions to delete trackers are mistakenly allowed to delete trackers owned by other accounts.
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- CVE.orgNov 4, 2026
- FIRST EPSSNov 4, 2026
- EUVDNov 4, 2026