Event Monitor Cyber
EM-20261112-3OMW VulnerabilityHigh severity

Action Pack Vulnerability (CVE-2026-126081)

CVE-2026-126081

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Status
Developing

Since : signals keep joining.

First Signal
Nov 10 21:19 UTCC6 NVD CVE API 2.0
Page Born
Nov 12 23:37 UTCsecond source joined
Last Signal
Nov 12 23:37 UTC16 hours before snapshot
Sources
20 official · 2 research, news or crowd
Open For
2 daysso far

Life Of This Page

  1. 1
    Born
    A second, independent source names it.
  2. 2
    Developing · Now
    New signals join; severity can move.
  3. 3
    Confirmed
    Not yet
    CISA KEV lists it, or exploitation in the wild is reported.
  4. 4
    Resolved
    Not yet
    Past the fix deadline and 14 days with no new signal.
  5. 5
    Archived
    Not yet
    30 days after resolved. Read only; the link keeps working. Reopens if it comes back.

The ID never changes, and earlier addresses keep working. A correction is logged, never overwritten. If two pages turn out to be one incident, the later one points to the earlier.

Vulnerability Lifecycle

  1. Disclosed: reached
    Nov 10 21:19 UTC
    C6 NVD published
  2. Scored: reached
    Nov 10 21:19 UTC
    CVSS 7.5 · EPSS 0.6%
  3. Exploited: not yet
    Not yet
    No exploitation reported
  4. Advisories: not yet
    Not yet
    None yet
  5. Vendor Response: not yet
    Not yet
    None in sources yet
  6. Resolved: not yet
    Not yet
    After 14 quiet days

Timeline

Nov 1112:00Nov 1212:00Nov 13BornC6 NVD CVE API 2.0C26 GitHub Advisory Database

Point at a mark to read it. Squares are signals, colored by severity; every one is also listed under Signals.

Signals

  1. GHSA-wm3x-v3qw-4jh3 / CVE-2026-126081: Action Pack: Possible Strong Parameters Bypass in Parameters#each_key (opens source in a new tab) rubygems:actionpack, rubygems:actionpack High severityDatabaseC26 GitHub Advisory Database
  2. CVE-2026-126081 (CVSS 7.5) (opens source in a new tab) Action Pack is a framework for handling and responding to web requests. Prior to 8.1.4.1 and 8.0.5.2, ActionController::Parameters#each_key delegates to the internal ActiveSupport::HashWithIndifferentAccess that holds… High severityDatabaseC6 NVD CVE API 2.0