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CVE-2026-55879 is a critical stored cross-site scripting vulnerability in OpenReplay, a self-hosted session replay suite. It affects versions 1.24.0 through versions before 1.25.0. The flaw exists because the OpenReplay tracking SDK accepts attacker-controlled custom event names and captured page URLs from any visitor who has a public project key, stores that data in ClickHouse without proper output encoding, and later renders it in the authenticated dashboard, including through the TextEllipsis component and the event-details modal. An unauthenticated attacker can therefore inject persistent script payloads that execute in the dashboard origin when viewed by an authenticated dashboard user. The vulnerability can be used to access sensitive session material stored in the browser, including the dashboard session JWT, enabling compromise of the victim dashboard account.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.