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PatchSiren cyber security CVE debrief

CVE-2016-8508 Yandex CVE debrief

CVE-2016-8508 is a warning-bypass issue in Yandex Browser for desktop. On websites using a special content-type, the browser did not display Protect warnings, which could let a remote attacker hide an important safety warning on a malicious site. NVD rates the issue as medium severity and lists remediation in version 17.1.1.227 and later.

Vendor
Yandex
Product
CVE-2016-8508
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2017-03-01
Original CVE updated
2026-05-13
Advisory published
2017-03-01
Advisory updated
2026-05-13

Who should care

Security and endpoint teams managing Yandex Browser deployments, especially on user workstations that browse untrusted or internet-facing content. SOC and phishing-defense teams should also care because the flaw weakens a browser warning designed to protect users from risky sites.

Technical summary

According to NVD, Yandex Browser for desktop versions before 17.1.1.227 can fail to show Protect warnings when a site uses a special content-type. The impact is warning suppression rather than code execution: a remote attacker may prevent the browser from presenting a browser-level safety warning to the user. NVD’s CVSS v3.1 vector is AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N, reflecting a network-reachable issue that requires user interaction.

Defensive priority

Medium. Prioritize patching on all desktop endpoints that use Yandex Browser, because the issue weakens a security warning users rely on when visiting malicious sites.

Recommended defensive actions

  • Upgrade Yandex Browser desktop to version 17.1.1.227 or later.
  • Verify fleet inventory for any installations below the fixed version and remediate them.
  • Ensure browser auto-update is enabled and that endpoints can complete updates promptly.
  • Treat browser warning systems as one layer only; reinforce phishing-resistant controls such as URL filtering, DNS/web filtering, and user awareness.
  • Confirm that endpoint management and support teams know this issue affects warning display, not browser stability, so it should still be patched promptly.

Evidence notes

Primary evidence comes from the NVD CVE record and the linked Yandex vendor advisory. NVD lists the vulnerable CPE as cpe:2.3:a:yandex:yandex_browser:*:*:*:*:*:*:*:* with versionEndExcluding 17.1.1.227, and the CVSS v3.1 vector as AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N. NVD also records CWE-254. The vendor advisory referenced by NVD states the fix was included in version 17.1.

Official resources

Publicly disclosed in the official CVE/NVD record on 2017-03-01. The source record was last modified on 2026-05-13, but the CVE issue date remains 2017-03-01. Vendor guidance referenced by NVD points to a fix in Yandex Browser version 17.1.