CVE-2026-0259

HIGHNVD 8.88.8
EchelonGraph scoreMEDIUM confidence

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

Score 8.8 from GitHub Security Advisory published 2026-05-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
8.8EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.8Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

The CVE record's CNA (Palo Alto Networks, Inc.) lists Palo Alto Networks WildFire WF-500 and WF-500-B versions 11.2.0 up to but not including 11.2.11,11.2.7-h7 and 11.1.0 up to but not including 11.1.13,11.1.10-h8 as affected. No release containing a fix is confirmed on record.

An arbitrary File Read and Delete Vulnerability in Palo Alto Networks WildFire® WF-500 and WF-500-B appliances enables users to read sensitive information and delete arbitrary files. This vulnerability affects WF-500 and WF-500-B appliances running in the default non-FIPS configuration mode.

The WildFire Appliance (WF-500, WF-500-B) software update is now available to customers that use the WildFire Appliance (WF-500, WF-500-B) for on-premise sandboxing.

Please note that customers using the WildFire Public cloud service are NOT impacted by this vulnerability.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity88% × 45%
The EG Score, 8.8 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
25th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (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

May 13, 2026

Last Modified

July 14, 2026

Advisory Details (1)

Auto-updated Jun 17, 2026
No fix on record yet.
Web page

CVE-2026-0259 WildFire WF-500 and WF-500-B: Arbitrary File Read and Delete Vulnerability in WildFire Appliance (WF-500, WF-500-B)

https://security.paloaltonetworks.com/CVE-2026-0259

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 24× 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.

Showing the most recent 100 of 230 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 130 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  2. 2026-10-12 16:42 UTCEG score recompute
  3. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  4. 2026-10-11 20:17 UTCEG score recompute
  5. 2026-10-11 18:29 UTCEG score recompute
  6. 2026-10-11 15:03 UTCEG score recompute
  7. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  8. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  9. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  10. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  11. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  13. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  14. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  16. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  17. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  18. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  19. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  20. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  21. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  22. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  23. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  24. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  25. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.3% · 26th percentile
Show 75 more
  1. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  2. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  3. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  4. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  5. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  6. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  7. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  8. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  9. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  10. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  11. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  12. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  13. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  14. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  15. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  16. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  17. 2026-08-23 17:51 UTCEG score recompute
  18. 2026-08-23 17:51 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  19. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  20. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  21. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  22. 2026-08-20 19:48 UTCEG score recompute
  23. 2026-08-20 19:48 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  24. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  25. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  26. 2026-08-17 10:39 UTCEG score recompute
  27. 2026-08-17 10:39 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  28. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  29. 2026-08-16 04:03 UTCEG score recompute
  30. 2026-08-16 04:03 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  31. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  32. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  33. 2026-08-15 00:31 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  34. 2026-08-14 13:31 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  35. 2026-08-14 02:31 UTCEG score recompute
  36. 2026-08-14 02:31 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  37. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  38. 2026-08-13 02:49 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  39. 2026-08-12 15:49 UTCEG score recompute
  40. 2026-08-12 15:49 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  41. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  42. 2026-08-11 15:28 UTCEG score recompute
  43. 2026-08-11 15:28 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  44. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  45. 2026-08-11 00:56 UTCEG score recompute
  46. 2026-08-11 00:56 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  47. 2026-08-10 23:59 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  48. 2026-08-10 11:30 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  49. 2026-08-09 23:54 UTCEG score recompute
  50. 2026-08-09 23:54 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  51. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  52. 2026-08-09 12:54 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  53. 2026-08-09 01:54 UTCEG score recompute
  54. 2026-08-09 01:54 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  55. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  56. 2026-08-08 04:58 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  57. 2026-08-07 17:58 UTCEG score recompute
  58. 2026-08-07 17:58 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  59. 2026-08-07 06:58 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  60. 2026-08-06 19:40 UTCEG score recompute
  61. 2026-08-06 19:40 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  62. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  63. 2026-08-06 08:41 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  64. 2026-08-05 21:40 UTCEG score recompute
  65. 2026-08-05 21:40 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  66. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  67. 2026-08-04 15:09 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  68. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  69. 2026-08-03 19:08 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  70. 2026-08-02 19:09 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  71. 2026-08-02 08:09 UTCEG score recompute
  72. 2026-08-02 08:09 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8
  73. 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  74. 2026-08-01 19:48 UTCEG score recompute
  75. 2026-08-01 19:48 UTCGHSA enrichmentGHSA-7g39-pmpc-x999 · GitHub CVSS 8.8

Frequently asked(5)

What is CVE-2026-0259?
CVE-2026-0259 is a high-severity vulnerability; its CVE record was published on May 13, 2026. An arbitrary File Read and Delete Vulnerability in Palo Alto Networks WildFire® WF-500 and WF-500-B appliances enables users to read sensitive information and delete arbitrary files. This vulnerability affects WF-500 and WF-500-B appliances running in the default non-FIPS configuration mode. The…
When was CVE-2026-0259 made public?
CVE-2026-0259 was made public on May 13, 2026: that is the date its CVE record's CNA, Palo Alto Networks, Inc., gives for when the vulnerability was made public. The CVE record itself was published on May 13, 2026. EchelonGraph's copy of the record carries a last-modified date of July 14, 2026; the record at its source may have been updated since.
Is CVE-2026-0259 actively exploited?
CVE-2026-0259 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (25th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-0259?
CVE-2026-0259 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-0259?
No fix for CVE-2026-0259 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (Palo Alto Networks, Inc.) lists Palo Alto Networks WildFire WF-500 and WF-500-B versions 11.2.0 up to but not including 11.2.11,11.2.7-h7 and 11.1.0 up to but not including 11.1.13,11.1.10-h8 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-0259 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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