CVE-2020-14456
CVE-2020-14456 is a high-severity vulnerability in Mattermost Mattermost Desktop with a CVSS 3.x base score of 7.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-346.
Key facts
- Severity: High (CVSS 3.x base score 7.3)
- CVSS v2: 7.5
- EPSS exploit prediction: 0% (34th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-346
- Affected product: Mattermost Mattermost Desktop
- Published:
- Last modified:
Description
An issue was discovered in Mattermost Desktop App before 4.4.0. The Same Origin Policy is mishandled during access-control decisions for web APIs, aka MMSA-2020-0006.
Frequently asked questions
- What is CVE-2020-14456?
- An issue was discovered in Mattermost Desktop App before 4.4.0. The Same Origin Policy is mishandled during access-control decisions for web APIs, aka MMSA-2020-0006.
- How severe is CVE-2020-14456?
- CVE-2020-14456 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
- Is CVE-2020-14456 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-14456?
- CVE-2020-14456 affects Mattermost Mattermost Desktop. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-14456?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2020-14456 published?
- CVE-2020-14456 was published on 2020-06-19 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:*
More vulnerabilities in Mattermost Mattermost Desktop
- CVE-2016-11064 — Critical (CVSS 9.8): An issue was discovered in Mattermost Desktop App before 3.4.0. Strings could be executed as code via injection.
- CVE-2019-20856 — Critical (CVSS 9.8): An issue was discovered in Mattermost Desktop App before 4.3.0 on macOS. It allows dylib injection.
- CVE-2019-20861 — High (CVSS 8.8): An issue was discovered in Mattermost Desktop App before 4.2.2. It allows attackers to execute arbitrary code via a…
- CVE-2026-1046 — High (CVSS 7.6): Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost…
- CVE-2026-8683 — Medium (CVSS 6.5): Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the…
- CVE-2026-3471 — Medium (CVSS 6.5): Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent an invalid URL from loading in a pop-up window in…
All CVEs affecting Mattermost Mattermost Desktop →
Other CWE-346 vulnerabilities
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- CVE-2026-2790 — Critical (CVSS 9.8): Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR…
- CVE-2022-50925 — Critical (CVSS 9.8): Prowise Reflect version 1.0.9 contains a remote keystroke injection vulnerability that allows attackers to send…
- CVE-2025-30466 — Critical (CVSS 9.8): This issue was addressed through improved state management. This issue is fixed in Safari 18.4, iOS 18.4 and iPadOS…
- CVE-2024-8487 — Critical (CVSS 9.8): A Cross-Origin Resource Sharing (CORS) vulnerability exists in modelscope/agentscope version v0.0.4. The CORS…