CVE-2026-6486 - classroombookings User Display Name layout.php read cross site scripting

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MEDIUM

classroombookings User Display Name layout.php read cross site scripting

Published Apr 17, 2026

5.1

MEDIUM

CVSS 4.0

EPSS 0.36%

Description

A vulnerability was detected in classroombookings up to 2.17.0. This impacts the function read of the file crbs-core/application/views/layout.php of the component User Display Name Handler. The manipulation of the argument displayname results in cross site scripting. The attack can be executed remotely. The exploit is now public and may be used. Upgrading to version 2.17.1 will fix this issue. The patch is identified as 69c3c9bb8a17f1ea572d8f4502bf238f0214c98a. It is suggested to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Affected products

Vendor Classroombookings Product Classroombookings Default
n/a
- Version
  2.0
  Status
  affected
  Constraints
  -
- Version
  2.1
  Status
  affected
  Constraints
  -
- Version
  2.10
  Status
  affected
  Constraints
  -
- Version
  2.11
  Status
  affected
  Constraints
  -
- Version
  2.12
  Status
  affected
  Constraints
  -
- Version
  2.13
  Status
  affected
  Constraints
  -
- Version
  2.14
  Status
  affected
  Constraints
  -
- Version
  2.15
  Status
  affected
  Constraints
  -
- Version
  2.16
  Status
  affected
  Constraints
  -
- Version
  2.17.0
  Status
  affected
  Constraints
  -
- Version
  2.2
  Status
  affected
  Constraints
  -
- Version
  2.3
  Status
  affected
  Constraints
  -
- Version
  2.4
  Status
  affected
  Constraints
  -
- Version
  2.5
  Status
  affected
  Constraints
  -
- Version
  2.6
  Status
  affected
  Constraints
  -
- Version
  2.7
  Status
  affected
  Constraints
  -
- Version
  2.8
  Status
  affected
  Constraints
  -
- Version
  2.9
  Status
  affected
  Constraints
  -
- Version
  2.17.1
  Status
  unaffected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Classroombookings

n/a

Version	Status	Constraints
2.0	affected	-
2.1	affected	-
2.10	affected	-
2.11	affected	-
2.12	affected	-
2.13	affected	-
2.14	affected	-
2.15	affected	-
2.16	affected	-
2.17.0	affected	-
2.2	affected	-
2.3	affected	-
2.4	affected	-
2.5	affected	-
2.6	affected	-
2.7	affected	-
2.8	affected	-
2.9	affected	-
2.17.1	unaffected	-

Remediation

No remediation recorded yet.

Weaknesses (2)

CWE-79

Cross-site Scripting (XSS)

CWE-94

Code Injection

References (9)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-23415
Advisory
https://github.com/classroombookings/classroombookings/
product
https://github.com/classroombookings/classroombookings/commit/69c3c9bb8a17f1ea572d8f4502bf238f0214c98a
patch
https://github.com/classroombookings/classroombookings/pull/83
issue-trackingpatch
https://github.com/classroombookings/classroombookings/releases/tag/v2.17.1
patch
https://github.com/sudo-secure/security-research/blob/main/classroombookings/stored-xss/PoC.md
exploit
https://vuldb.com/submit/786154
third-party-advisory
https://vuldb.com/vuln/358027
vdb-entrytechnical-description
https://vuldb.com/vuln/358027/cti
signaturepermissions-required

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-23415		Advisory
https://github.com/classroombookings/classroombookings/		product
https://github.com/classroombookings/classroombookings/commit/69c3c9bb8a17f1ea572d8f4502bf238f0214c98a		patch
https://github.com/classroombookings/classroombookings/pull/83		issue-trackingpatch
https://github.com/classroombookings/classroombookings/releases/tag/v2.17.1		patch
https://github.com/sudo-secure/security-research/blob/main/classroombookings/stored-xss/PoC.md		exploit
https://vuldb.com/submit/786154		third-party-advisory
https://vuldb.com/vuln/358027		vdb-entrytechnical-description
https://vuldb.com/vuln/358027/cti		signaturepermissions-required