How severe is CVE-2026-34931?

CVE-2026-34931 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34931 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34931?

CVE-2026-34931 affects Hoppscotch. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34931?

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-2026-34931 have an EU (EUVD) identifier?

Yes. CVE-2026-34931 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18538.

When was CVE-2026-34931 published?

CVE-2026-34931 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-34931

CVE-2026-34931 is a critical-severity vulnerability in Hoppscotch with a CVSS 3.x base score of 9.6. 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-601.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
CVSS v4: 8.5
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18538
Weakness: CWE-601
Affected product: Hoppscotch
Published: 2026-04-02
Last modified: 2026-06-17

Description

hoppscotch is an open source API development ecosystem. Prior to version 2026.3.0, there is an open redirect vulnerability that leads to token exfiltration. With these tokens, the attacker can sign in as the victim to takeover their account. This issue has been patched in version 2026.3.0.

Frequently asked questions

What is CVE-2026-34931?: hoppscotch is an open source API development ecosystem. Prior to version 2026.3.0, there is an open redirect vulnerability that leads to token exfiltration. With these tokens, the attacker can sign in as the victim to takeover their account. This issue has been patched in version 2026.3.0.
How severe is CVE-2026-34931?: CVE-2026-34931 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34931 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34931?: CVE-2026-34931 affects Hoppscotch. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34931?: 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-2026-34931 have an EU (EUVD) identifier?: Yes. CVE-2026-34931 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18538.
When was CVE-2026-34931 published?: CVE-2026-34931 was published on 2026-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hoppscotch:hoppscotch:*:*:*:*:*:*:*:*

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Other CWE-601 (Open Redirect) vulnerabilities

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CVE-2020-36912 — Critical (CVSS 9.8): Plexus anblick Digital Signage Management 3.1.13 contains an open redirect vulnerability in the 'PantallaLogin' script…
CVE-2025-43526 — Critical (CVSS 9.8): This issue was addressed with improved URL validation. This issue is fixed in Safari 26.2, macOS Tahoe 26.2. On a Mac…
CVE-2025-55031 — Critical (CVSS 9.8): Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An…
CVE-2024-22891 — Critical (CVSS 9.8): Nteract v.0.28.0 was discovered to contain a remote code execution (RCE) vulnerability via the Markdown link.

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