How severe is CVE-2026-4263?

CVE-2026-4263 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2026-4263 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-4263?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-4263 have an EU (EUVD) identifier?

Yes. CVE-2026-4263 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16150.

When was CVE-2026-4263 published?

CVE-2026-4263 was published on 2026-03-26 and last updated on 2026-06-17.

CVE-2026-4263

CVE-2026-4263 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. 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-863.

Key facts

Severity: Medium (CVSS 4.0 base score 6.9)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16150
Weakness: CWE-863
Published: 2026-03-26
Last modified: 2026-06-17

Description

Vulnerability of incorrect authorization in HiJiffy Chatbot allows an attacker to download private messages from other users via the parameter 'visitor' in '/api/v1/webchat/message'.

Frequently asked questions

What is CVE-2026-4263?: Vulnerability of incorrect authorization in HiJiffy Chatbot allows an attacker to download private messages from other users via the parameter 'visitor' in '/api/v1/webchat/message'.
How severe is CVE-2026-4263?: CVE-2026-4263 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2026-4263 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-4263?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4263 have an EU (EUVD) identifier?: Yes. CVE-2026-4263 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16150.
When was CVE-2026-4263 published?: CVE-2026-4263 was published on 2026-03-26 and last updated on 2026-06-17.

References

https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-hijiffy-chatbot

Other CWE-863 (Incorrect Authorization) vulnerabilities

CVE-2026-48286 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) versions 7.4.3 build 9396 and earlier are affected by an Incorrect Authorization…
CVE-2026-48303 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) versions 7.4.3 build 9394 and earlier are affected by an Incorrect Authorization…
CVE-2026-44330 — Critical (CVSS 10.0): free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the…
CVE-2026-46595 — Critical (CVSS 10.0): Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of…
CVE-2026-33105 — Critical (CVSS 10.0): Improper authorization in Microsoft Azure Kubernetes Service allows an unauthorized attacker to elevate privileges over…
CVE-2026-32213 — Critical (CVSS 10.0): Improper authorization in Azure AI Foundry allows an unauthorized attacker to elevate privileges over a network.

Browse all CWE-863 (Incorrect Authorization) vulnerabilities →