CVE-2025-55127: HackerOne community member Dao Hoang Anh (yoyomiski) has reported an improper neutralization of whitespace in

Routine

MEDIUM 5.4UPGRADE

CVE-2025-55127 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 Dao Hoang Anh (yoyomiski) has reported an improper neutralization of whitespace in the username when adding new users. A username with leading or trailing whitespace could be virtually indistinguishable from its legitimate counterpart when the username is displayed in the UI, potentially leading to confusion.

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-156
Published	2025-11-20
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

2025-11-20 19:16 UTCPublished CVE record published
2026-06-17 09:41 UTCUpdated Record last modified

aquaplatform revive adserver UPGRADE

Affected: >= 6.0.0 and < 6.0.3

Fixed in: 6.0.3

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 6.0.3 (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-2025-55127?

revive adserver: upgrade to 6.0.3. Exact commands for each OS are on this page.

Is CVE-2025-55127 being exploited?

CVE-2025-55127 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-2025-55127 affect?

CVE-2025-55127 affects revive adserver. Severity is medium (CVSS 5.4). HackerOne community member Dao Hoang Anh (yoyomiski) has reported an improper neutralization of whitespace in the username when adding new users. A username with leading or trailing whitespace could be virtually indistinguishable from its l

How urgent is CVE-2025-55127?

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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