CVE-2026-72887
Net::OAuth::Client <0.32 silently downgrades OAuth 1.0a to 1.0, enabling session fixation.
Is CVE-2026-72887 being exploited?
Not confirmed. CVE-2026-72887 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 0.55% probability of exploitation in the next 30 days.
How severe is CVE-2026-72887?
CVE-2026-72887 is rated Critical with a CVSS score of 9.8. 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-2026-72887?
Yes. A fix has been recorded for CVE-2026-72887. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-72887 affect?
CVE-2026-72887 affects Net::OAuth::Client < 0.32, Perl web applications using Net::OAuth::Client, Services relying on OAuth 1.0a via this client. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-72887?
Upgrade Net::OAuth::Client to >=0.32 and enforce oauth_callback_confirmed/oauth_verifier checks.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Silent downgrade drops oauth_verifier enabling OAuth 1.0 session fixation — attacker can bind victim's account to attacker-controlled session (account takeover/unauthorized actions).
Immediate action required