How severe is CVE-2026-55454?

CVE-2026-55454 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-55454 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-55454?

CVE-2026-55454 affects Appsmith. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-55454?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-55454 have an EU (EUVD) identifier?

Yes. CVE-2026-55454 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39118.

When was CVE-2026-55454 published?

CVE-2026-55454 was published on 2026-06-24 and last updated on 2026-06-26.

CVE-2026-55454

CVE-2026-55454 is a critical-severity vulnerability in Appsmith with a CVSS 3.x base score of 9.9. 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-749.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39118
Weakness: CWE-749
Affected product: Appsmith
Published: 2026-06-24
Last modified: 2026-06-26

Description

Appsmith is a platform to build admin panels, internal tools, and dashboards. Prior to 2.1, the bundled Caddy reverse-proxy's admin API — which has no authentication by default — is bound on 0.0.0.0:2019 inside the container. While this listener is not directly published to the host by docker-compose.yml, it is reachable from the Appsmith server process itself or a SSRF vulnerability. An authenticated low-privileged user can therefore drive the SSRF to issue POST /load (or any other admin-API call) against http://0.0.0.0:2019/, fully replacing the live Caddy configuration and taking over the reverse proxy. This vulnerability is fixed in 2.1.

Frequently asked questions

What is CVE-2026-55454?: Appsmith is a platform to build admin panels, internal tools, and dashboards. Prior to 2.1, the bundled Caddy reverse-proxy's admin API — which has no authentication by default — is bound on 0.0.0.0:2019 inside the container. While this listener is not directly published to the host by docker-compose.yml, it is reachable from the Appsmith server process itself or a SSRF vulnerability. An authenticated low-privileged user can therefore drive the SSRF to issue POST /load (or any other admin-API call) against http://0.0.0.0:2019/, fully replacing the live Caddy configuration and taking over the reverse proxy. This vulnerability is fixed in 2.1.
How severe is CVE-2026-55454?: CVE-2026-55454 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-55454 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-55454?: CVE-2026-55454 affects Appsmith. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-55454?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-55454 have an EU (EUVD) identifier?: Yes. CVE-2026-55454 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39118.
When was CVE-2026-55454 published?: CVE-2026-55454 was published on 2026-06-24 and last updated on 2026-06-26.

References

https://github.com/appsmithorg/appsmith/security/advisories/GHSA-8jvv-gwqg-6vjc

Affected products (1)

cpe:2.3:a:appsmith:appsmith:*:*:*:*:*:*:*:*

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