What’s Vulnerable › Vulnerabilities

CVE-2021-22889

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 30.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-25 · updated 2026-06-17
• Weakness: CWE-79

Description

Revive Adserver before v5.2.0 is vulnerable to a reflected XSS vulnerability in the `statsBreakdown` parameter of stats.php (and possibly other scripts) due to single quotes not being escaped. An attacker could trick a user with access to the user interface of a Revive Adserver instance into clicking on a specifically crafted URL and pressing a certain key combination to execute injected JavaScript code.

Affected products

• Revive Adserver: before 5.2.0 — fixed in 5.2.0

How to fix

Upgrade to a fixed version: Revive Adserver 5.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/revive-adserver/revive-adserver/commit/2f868414
• https://hackerone.com/reports/1097217
• https://www.revive-adserver.com/security/revive-sa-2021-003/
• https://github.com/revive-adserver/revive-adserver/commit/2f868414
• https://hackerone.com/reports/1097217
• https://www.revive-adserver.com/security/revive-sa-2021-003/

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