CVE-2026-52843
Lightpanda <0.2.9 leaks session cookies on fetch/XHR, enabling authenticated cross-origin requests.
Is CVE-2026-52843 being exploited?
Not confirmed. CVE-2026-52843 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.23% probability of exploitation in the next 30 days.
How severe is CVE-2026-52843?
CVE-2026-52843 is rated Critical. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-52843?
Yes. A fix has been recorded for CVE-2026-52843. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-52843 affect?
CVE-2026-52843 affects Lightpanda <0.2.9, Applications/automation pipelines using Lightpanda, AI/automation services embedding Lightpanda. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-52843?
Upgrade to Lightpanda >=0.2.9; avoid running untrusted origins; rotate affected sessions.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker-controlled origin in a Lightpanda session can send victim session cookies on cross-origin requests, enabling authenticated actions, data access, and exfiltration.
Immediate action required
- affected< 0.2.9
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.