Stored XSS in Participant URL Field leads to Account Takeover via Session Token Theft

published 2026-07-31 3 mo ago modified 2026-10-23 16 d ago also EUVD-2026-51594

cvss: 7.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits: 0; none known

Stored cross-site scripting in the participant URL handling in AWS Ops Wheel before PR #168 might allow an authenticated remote user to steal session tokens and escalate to full administrative control of the deployed instance via a crafted participant_url value containing a dangerous URI scheme.

To remediate this issue, users should redeploy from the latest version of aws-ops-wheel.

Patch / fix

links 1

github.com/aws/aws-ops-wheel#168 pull request

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 3 mo ago (2026-07-31)

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
CNA	4.0	6.2	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
CNA	4.0	6.2	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/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

AWS AWS Ops Wheel

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /aws/aws-ops-wheel/pull/168
patch
aws.amazon.com /security/security-bulletins/2026-068-aws/
vendor-advisory
github.com /aws/aws-ops-wheel/security/advisories/GHSA-6rr8-cf9x-pj23
third-party-advisory

Sources

CVE List CVE-2026-18481
NVD CVE-2026-18481

Fencer Vulns 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.

Summary