CVE-2026-93477: ash · Mass Assignment
Affects ashSource CVE Database V5
Mentioned vulnerabilities
Not known to be exploited · CVSS 5.9 Medium : upgrade to 3.33.11 when convenient.
Data as of 8 Nov 2026, 23:24 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 3.33.11, 6b7ac53a0a2532291eb940d7beaf0fbb2da6fc4f
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.
What to do
Upgrade ash to 3.33.11; ash to 6b7ac53a0a2532291eb940d7beaf0fbb2da6fc4f.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| ash-projectash | Affected
| Fixed in
|
| ash-projectash | Affected
| Fixed in
|
Hexashpkg:hex/ashOther threats | Affected
| Fixed in
|
CPE configurations (1)
cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available in ash versions 3.33.11 and later, which enforces the public? attribute check on argument matching in bulk destroy and bulk update paths. Users should upgrade to version 3.33.11 or later to remediate this vulnerability. Until then, avoid exposing bulk destroy or bulk update actions to untrusted input or implement additional access controls to prevent unauthorized parameter submission.
Description
Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in ash-project ash allows a user to set the value of a private action argument on the bulk destroy and bulk update paths. Action arguments declared with public?: false are meant to be set only by trusted server-side code (for example via Ash.Changeset.set_private_argument/3) and must not be settable from end-user input. CVE-2026-55736 fixed the non-bulk changeset path to strip private arguments from user-supplied parameter maps, but the bulk destroy and bulk update paths were not covered. Ash.Actions.Destroy.Bulk.base_changeset/5 and Ash.Actions.Update.Bulk.base_changeset/5 match every key in the caller-supplied parameter map against all of the action's arguments with no public? check, then apply the matches to the base changeset. A caller who can submit parameters to a bulk destroy or bulk update action (for example through AshJsonApi, AshGraphql, or a controller that forwards request parameters to Ash.bulk_destroy/4 or Ash.bulk_update/4) can therefore set any private argument of that action, including one referenced by an arg(...) template in the action's changes or validations. Depending on how the application uses the argument (for example an acting_user_id driving authorization or record ownership, or audit metadata), this can lead to an integrity violation or privilege escalation. The fix requires public? in the argument matching on both bulk paths; private arguments remain settable server-side via the :private_arguments option. This issue affects ash: from 2.17.15 before 3.33.11.
References
- github.com/ash-project/ash/security/advisories/GHSA-c2p4-p7q6-hr2j (opens in a new tab)
- cna.erlef.org/cves/CVE-2026-93477.html (opens in a new tab)
- osv.dev/vulnerability/EEF-CVE-2026-93477 (opens in a new tab)
- github.com/ash-project/ash/commit/8c17434803b2e91de522bdfbd0ca918e5d5898df (opens in a new tab)
- github.com/ash-project/ash/commit/6b7ac53a0a2532291eb940d7beaf0fbb2da6fc4f (opens in a new tab)