CVE-2025-55129: HackerOne community member Kassem S.(kassem_s94) has reported that username handling in Revive Adserver was st

Routine

MEDIUM 5.4UPGRADE

CVE-2025-55129 is a medium-severity flaw (CVSS 5.4) affecting revive adserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HackerOne community member Kassem S.(kassem_s94) has reported that username handling in Revive Adserver was still vulnerable to impersonation attacks after the fix for CVE-2025-52672, via several alternate techniques. Homoglyphs based impersonation has been independently reported by other HackerOne users, such as itz_hari_ and khoof.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-176
Published	2025-12-02
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: aquaplatform

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-02 02:15 UTCPublished CVE record published
2026-06-17 09:41 UTCUpdated Record last modified

aquaplatform revive adserver UPGRADE

Affected: >= 6.0.0 and < 6.0.4

Fixed in: 6.0.4

Safe to downgrade to: a release before 6.0.0

1. Check installed version

apt-cache policy revive-adserver || rpm -q revive-adserver || revive-adserver --version

2. UPGRADE to 6.0.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade revive-adserver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade revive-adserver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.0.0 (Debian / Ubuntu)

apt-cache madison revive-adserver sudo apt install revive-adserver=<VERSION_BEFORE_6.0.0> sudo apt-mark hold revive-adserver

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list revive-adserver sudo dnf downgrade revive-adserver-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add revive-adserver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-55129?

revive adserver: upgrade to 6.0.4. Exact commands for each OS are on this page.

Is CVE-2025-55129 being exploited?

CVE-2025-55129 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-55129 affect?

CVE-2025-55129 affects revive adserver. Severity is medium (CVSS 5.4). HackerOne community member Kassem S.(kassem_s94) has reported that username handling in Revive Adserver was still vulnerable to impersonation attacks after the fix for CVE-2025-52672, via several alternate techniques. Homoglyphs based imper

How urgent is CVE-2025-55129?

Priority 28/100. Public exploit reference

Related CVEs

CVE-2026-50741 HIGH 8.8 UPGRADE Bypass to the fix for CVE-2026-34916
CVE-2026-50745 MEDIUM 6.1 UPGRADE A missing sanitisation vulnerability exists with user input in the stats-video.php script
CVE-2026-50740 MEDIUM 5.4 UPGRADE A missing sanitisation vulnerability of user input in the zone-include.php script exists in Revive Adserver 6.
CVE-2026-50742 MEDIUM 5.4 UPGRADE A stored XSS vulnerabilities exists in the `maintenance-acl-check.php` and `maintenance-banners-check.php` too
CVE-2026-50739 MEDIUM 4.3 UPGRADE A bypass for CVE‑2026‑34913 exists with proper ownership validation that had not been applied to the reverse o

References

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