PT-2026-3657 · Revive+2 · Revive Adserver

Faraz Ahmed + 1 · CVE-2026-21640 · Published 2026-01-20 · Updated 2026-01-20

Positive Technologies (AI Summary)

CVSS v3.1

2.7

Low

Base vector

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

Name of the Vulnerable Software and Affected Versions Revive Adserver (affected versions not specified)

Description A format string injection exists in the settings of the software. Using specific character combinations within a setting can trigger a fatal PHP error, which may result in the admin user console being disabled.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Use of Externally-Controlled Format String

Weakness Enumeration

CWE-134

Related Identifiers

CVE-2026-21640

Affected Products

Revive Adserver

References · 4

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21640.json · Exploit
• https://osv.dev/vulnerability/CVE-2026-21640 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21640 · Security Note
• https://hackerone.com/reports/3445332 · Note