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CVE-2026-7839

UltraVNC repeater through 1.8.2.2 initializes the HTTP administration server with a hardcoded default password. In repeater/webgui/settings.c:197, when settings2.txt is absent on first run the repeater writes the literal string "adminadmi2" as the admin password via strcpy_s(saved_password, 64, "adminadmi2"). The HTTP Basic-auth handler wi_decode_auth() checks this password without rate-limiting or lockout. Any remote attacker who can reach the repeater HTTP port (default TCP 80) can authenticat
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:380d3dc44f6354c8cf600d441873c1befe8013ef4de41f9ba6b104f1cb7dc99a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","modules":["repeater"],"product":"UltraVNC","vendor":"uvnc","versions":[{"lessThanOrEqual":"1.8.2.2","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:114626f7cd3e2920346a5f37ecee0e7fe45b0a91423a9a8c31ea2f1bc7f88406 · sha256:384fed8f9703687b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:114626f7cd3e2920346a5f37ecee0e7fe45b0a91423a9a8c31ea2f1bc7f88406 · sha256:384fed8f9703687b… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-798","description":"Use of Hard-coded Credentials","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:114626f7cd3e2920346a5f37ecee0e7fe45b0a91423a9a8c31ea2f1bc7f88406 · sha256:384fed8f9703687b… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"UltraVNC source repository","tags":["product"],"url":"https://github.com/ultravnc/UltraVNC"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:114626f7cd3e2920346a5f37ecee0e7fe45b0a91423a9a8c31ea2f1bc7f88406 · sha256:384fed8f9703687b… · /containers/cna/references/1
{"name":"UltraVNC project page","tags":["vendor-advisory"],"url":"https://uvnc.com/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:114626f7cd3e2920346a5f37ecee0e7fe45b0a91423a9a8c31ea2f1bc7f88406 · sha256:384fed8f9703687b… · /containers/cna/references/0
{"url":"https://www.securin.io/zero-days/cve-2026-7839-hardcoded-default-admin-password-adminadmi2-ultravnc-repeater"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:114626f7cd3e2920346a5f37ecee0e7fe45b0a91423a9a8c31ea2f1bc7f88406 · sha256:384fed8f9703687b… · /containers/cna/references/2

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.

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