CVE-2026-58392

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (19th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-102132 (ENISA EUVD)Source: ENISA EUVD

5.4EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.4Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the NTP GPS page stores the operator-supplied initcmd value in base64 form, applies legacy_html_escape_form_data() to the encoded string, and then uses base64_decode() to decode the value directly into the GPS initialization-command textarea in src/www/services_ntpd_gps.php. Because decoding occurs after escaping, stored HTML remains unescaped at the output sink. A user with page-services-ntp-gps privilege can store a value that closes the textarea, and script executes in the session of any user who later opens the GPS page. The script can read CSRF material and perform authenticated actions, including actions available to an administrator. This issue is fixed in version 26.1.11.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity54% × 45%
Impact severity (EG Severity): CVSS 5.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
19th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.4): severity, escalated by confirmed exploitation. This CVE's 5.4 is its impact severity (EG Severity), not escalated.

EG Severity
5.4 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

October 15, 2026

Last Modified

October 15, 2026

Advisory Details (4)

Auto-updated Oct 15, 2026
🔬 Proof of concept available. Fix named in the CVE record. Sources: github, github_commit.
Web page🟡 PoC Available

Chasing the OPNsense RCE: The Story Behind My First CVEs (CVE-2026-57155) | HackerAsk

https://hackerask.com/posts/opnsense
GitHub commit

commit ed04a154dc40 (opnsense/core)

Fix landed in opnsense/core commit ed04a154dc40 — awaiting tagged release

https://github.com/opnsense/core/commit/ed04a154dc40967541be1388e9134e451be4199e
GitHub commit

commit a92d9514b543 (opnsense/core)

Fix landed in opnsense/core commit a92d9514b543 — awaiting tagged release

https://github.com/opnsense/core/commit/a92d9514b5436c868f8f97138ebed507f6de423c
GitHub advisoryMentions a patch (unverified)🟡 PoC Available

Stored XSS in Services: NTP GPS · Advisory · opnsense/core · GitHub

https://github.com/opnsense/core/security/advisories/GHSA-h793-67jm-j4m5

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 22× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  3. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  4. 2026-10-27 19:55 UTCOSV refresh
  5. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  6. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  7. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-10-25 14:16 UTCEG score recompute
  9. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  10. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  11. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  12. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  13. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  14. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  15. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  16. 2026-10-18 03:28 UTCEG score recompute
  17. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  18. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  19. 2026-10-15 16:29 UTCEG score recompute
  20. 2026-10-15 16:06 UTCEG score recompute
  21. 2026-10-15 15:38 UTCEG score recomputeFirst assessed: 5.4 MEDIUM
  22. 2026-10-15 15:37 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-58392?
CVE-2026-58392 is a medium-severity vulnerability; its CVE record was published on October 15, 2026. OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the NTP GPS page stores the operator-supplied initcmd value in base64 form, applies legacyhtmlescapeformdata() to the encoded string, and then uses base64decode() to decode the value directly into the GPS…
When was the CVE record for CVE-2026-58392 published?
The CVE record for CVE-2026-58392 was published on October 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 15, 2026; the record at its source may have been updated since.
Is CVE-2026-58392 actively exploited?
CVE-2026-58392 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-58392?
CVE-2026-58392 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-58392?
The CVE record for CVE-2026-58392 names the fix: "This issue is fixed in version 26.1.11."

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