# CVE-2026-82811: Toggl OÜ Toggl Track Extension postMessage origin validation

Status: published. Published: 2026-08-31. Updated: 2026-11-11.

A security vulnerability has been detected in Toggl OÜ Toggl Track Extension up to 4.11.21. This affects an unknown function of the component postMessage Handler. The manipulation leads to origin validation error. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 4.11.22 mitigates this issue. Upgrading the affected component is advised. The vendor confirms, that "[i]t was fixed in 4.11.21 on Chrome and 4.11.22 on Firefox."

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Toggl OÜ / Toggl Track Extension: 4.11.0 (affected); 4.11.1 (affected); 4.11.2 (affected); 4.11.3 (affected); 4.11.4 (affected); 4.11.5 (affected); 4.11.6 (affected); 4.11.7 (affected); 4.11.8 (affected); 4.11.9 (affected); 4.11.10 (affected); 4.11.11 (affected); 4.11.12 (affected); 4.11.13 (affected); 4.11.14 (affected); 4.11.15 (affected); 4.11.16 (affected); 4.11.17 (affected); 4.11.18 (affected); 4.11.19 (affected); 4.11.20 (affected); 4.11.21 (affected); 4.11.22 (unaffected). Source: CNA: VulDB

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P; source: CNA: VulDB

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L/E:P/RL:O/RC:C; source: CNA: VulDB

- CVSS 3.0: 5.4 (medium); CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L/E:P/RL:O/RC:C; source: CNA: VulDB

- CVSS 2.0: 6.4 (medium); AV:N/AC:L/Au:N/C:N/I:P/A:P/E:POC/RL:OF/RC:C; source: CNA: VulDB

- CVSS 4.0: 2.1 (low); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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; source: NVD: cna@vuldb.com

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L; source: NVD: cna@vuldb.com

- CVSS 2.0: 6.4 (medium); AV:N/AC:L/Au:N/C:N/I:P/A:P; source: NVD: cna@vuldb.com

- CISA KEV: No listing in collected sources

- EPSS: 0.22% as of 2026-11-10; percentile 12.37%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-346, CWE-345

## Exploit evidence

- exploit: https://github.com/xryj920/chrome_extensions/blob/main/Toggl%20O%C3%9C%20Toggl%20Track%204.11.16%20accepts%20forged%20session-state%20messages%20through%20an%20unauthenticated%20postMessage%20handler (CNA: VulDB)

## References

- https://vuldb.com/vuln/397230 (CNA: VulDB; vdb-entry)

- https://vuldb.com/vuln/397230/cti (CNA: VulDB; signature, permissions-required)

- https://vuldb.com/cve/CVE-2026-82811 (CNA: VulDB; third-party-advisory)

- https://vuldb.com/submit/875273 (CNA: VulDB; third-party-advisory)

- https://github.com/xryj920/chrome_extensions/blob/main/Toggl%20O%C3%9C%20Toggl%20Track%204.11.16%20accepts%20forged%20session-state%20messages%20through%20an%20unauthenticated%20postMessage%20handler (CNA: VulDB; exploit)

- https://github.com/xryj920/chrome_extensions/blob/main/Toggl%20O%C3%9C%20Toggl%20Track%204.11.16%20accepts%20forged%20session-state%20messages%20through%20an%20unauthenticated%20postMessage%20handler (cna@vuldb.com)

- https://vuldb.com/cve/CVE-2026-82811 (cna@vuldb.com)

- https://vuldb.com/submit/875273 (cna@vuldb.com)

- https://vuldb.com/vuln/397230 (cna@vuldb.com)

- https://vuldb.com/vuln/397230/cti (cna@vuldb.com)

## Provenance

- CNA: VulDB: https://www.cve.org/CVERecord?id=CVE-2026-82811; retrieved 2026-11-11; source updated 2026-11-11

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-82811; retrieved 2026-11-11; source updated 2026-11-11

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-82811; retrieved 2026-11-11; source updated Not reported

Revision: adda91e066a919979a2cdd45191243042e5aef9a057798fd6ea2cf39ad33433b

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