Administrator-level script execution via unsanitized plugin settings
Published Aug 30, 2023 · Updated Apr 28, 2026
Stored XSS in Alexander Semikashev Yandex Metrica Counter 1.4.3 and earlier allows remote authenticated users to execute scripts. Plugin settings accept values without sufficient input sanitization and later render them without adequate output escaping, preserving attacker-supplied JavaScript. Administrator-level access is required, and exploitation is limited to multisite installations or sites where unfiltered_html is disabled; the script runs when a user opens an injected page.
Summary
What happened
Stored XSS in Alexander Semikashev Yandex Metrica Counter 1.4.3 and earlier allows remote authenticated users to execute scripts. Plugin settings accept values without sufficient input sanitization and later render them without adequate output escaping, preserving attacker-supplied JavaScript. Administrator-level access is required, and exploitation is limited to multisite installations or sites where unfiltered_html is disabled; the script runs when a user opens an injected page.
The record
- CVE
- CVE-2023-34173
- Published
- Aug 30, 2023
- Updated
- Apr 28, 2026
- Vendor
- Yandex
- Product
- Yandex Metrica
- Classifications
- CWE-79, CAPEC-592, T1059.007
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Aug 30, 2023CVE publishedPublication date reported by the CVE source.
- Apr 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=n/a <=1.4.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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