Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-43633

HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a session format mismatch between PHP and Node.js that allows unauthenticated remote attackers to achieve root-level code execution. Attackers can inject crafted data into HTTP headers that are processed by the PHP session handler but incorrectly deserialized by the Node.js web terminal component as trusted session values, resulting in arbitrary command execution on systems with
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:41ba8b4f297c690f5280d5277789c2242dcb1435af387322f969d4e7cf124c3a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bb2b88971c2387147172b29b79bf1e448d1de80fc51c7e06caacf787af3b70f6 · sha256:7ac3684ee0dfb32a… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":9.5,"baseSeverity":"CRITICAL","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityIm…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bb2b88971c2387147172b29b79bf1e448d1de80fc51c7e06caacf787af3b70f6 · sha256:7ac3684ee0dfb32a… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"affected","packageURL":"pkg:github/hestiacp/hestiacp","product":"hestiacp","repo":"https://github.com/hestiacp/hestiacp","vendor":"hestiacp","versions":[{"lessThanOrEqual":"1.9.4","status":"affected","version":"1.9.0","versionType":"semver"},{"status":"unaffected","version":"854d71b3c1737b0a0d0cc55c926008ffe1f6719b","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bb2b88971c2387147172b29b79bf1e448d1de80fc51c7e06caacf787af3b70f6 · sha256:7ac3684ee0dfb32a… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bb2b88971c2387147172b29b79bf1e448d1de80fc51c7e06caacf787af3b70f6 · sha256:7ac3684ee0dfb32a… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":9.5,"baseSeverity":"CRITICAL","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityIm…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bb2b88971c2387147172b29b79bf1e448d1de80fc51c7e06caacf787af3b70f6 · sha256:7ac3684ee0dfb32a… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-502","description":"CWE-502 Deserialization of Untrusted Data","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bb2b88971c2387147172b29b79bf1e448d1de80fc51c7e06caacf787af3b70f6 · sha256:7ac3684ee0dfb32a… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["patch"],"url":"https://github.com/hestiacp/hestiacp/commit/854d71b3c1737b0a0d0cc55c926008ffe1f6719b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bb2b88971c2387147172b29b79bf1e448d1de80fc51c7e06caacf787af3b70f6 · sha256:7ac3684ee0dfb32a… · /containers/cna/references/3
{"tags":["issue-tracking"],"url":"https://github.com/hestiacp/hestiacp/issues/5229"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bb2b88971c2387147172b29b79bf1e448d1de80fc51c7e06caacf787af3b70f6 · sha256:7ac3684ee0dfb32a… · /containers/cna/references/1
{"tags":["issue-tracking"],"url":"https://github.com/hestiacp/hestiacp/pull/5244"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bb2b88971c2387147172b29b79bf1e448d1de80fc51c7e06caacf787af3b70f6 · sha256:7ac3684ee0dfb32a… · /containers/cna/references/2
{"tags":["technical-description","exploit"],"url":"https://mercuryiss.com.au/hestiacp-unauthenticated-rce-ip-spoofing-cve-2026-43633-cve-2026-43634"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bb2b88971c2387147172b29b79bf1e448d1de80fc51c7e06caacf787af3b70f6 · sha256:7ac3684ee0dfb32a… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/hestiacp-deserialization-rce-via-web-terminal"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bb2b88971c2387147172b29b79bf1e448d1de80fc51c7e06caacf787af3b70f6 · sha256:7ac3684ee0dfb32a… · /containers/cna/references/4

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

← Back to CVE Explorer