CVE-2026-111368 json
ClassroomIO through 1.0.0 IDOR via Course Submission Update, Grade and Delete Routes
published 25d ago modified 24d ago also EUVD-2026-102508
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
Summary
ClassroomIO through 1.0.0 contains an insecure direct object reference vulnerability in the Hono API course submission routes that allows course tutors or admins to modify submissions in other courses. Attackers can supply their own course id with another course's submission UUID to PUT or DELETE handlers to overwrite answers, grades, feedback, and grading status or delete submissions.
Patch / fix
Is CVE-2026-111368 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 24d ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- hackmd.io https://hackmd.io/@hieuPenguinnn/classroomio-course-resource-id-scoping-idor referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.1 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N |
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L |
| CNA | 4.0 | 6.1 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- classroomio ClassroomIO
Classification
- Weakness
-
- CWE-639 Authorization Bypass Through User-Controlled Key
References
-
github.com
/classroomio/classroomio/commit/1844ad9671a0d9c2566d3431d82f34d39016242c
patch
-
hackmd.io
/@hieuPenguinnn/classroomio-course-resource-id-scoping-idor
third-party-advisory, exploit
-
github.com
/classroomio/classroomio/blob/v1.0.0/apps/api/src/routes/course/submission.ts
technical-description
-
github.com
/classroomio/classroomio/blob/v1.0.0/packages/db/src/queries/submission/submission.ts#L217-L245
technical-description
-
github.com
/classroomio/classroomio
product
-
vulncheck.com
/advisories/classroomio-through-1.0.0-idor-via-course-submission-update-grade-and-delete-routes
third-party-advisory
Sources
- CVE List CVE-2026-111368
- NVD CVE-2026-111368
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.